IP phones classify their voice and control traffic at Layer2 (802.1Q/p) and at Layer3(DSCP).
The recommended configuration is to trust the L2 (CoS) classification applied by the phone on the access port servicing the phone.
This is accomplished through the application of the trust cos port configuration option. Although the IP phone will classify traffic from the PC port with a cos 0, setting at the access-port using switchport priority extend cos 0 has the same desired affect.
The following is an example of a port configuration, which will trust both RTP and Control traffic from the IP phone.
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